Documents & Writing
Best Plagiarism Checkers in 2026
When you need to check writing for matching material, the source coverage and submission limits are useful places to start. Compare academic and web source matching with supported languages and word limits to see what each checker covers and accepts.
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Copyleaks AI Detector It suits writers, students, professionals, creators, educational institutions, and enterprise teams seeking AI-text detection.
From $13.99/mo Free trial Web · API · Self-hosted · Browser extension9.2 Visit Specs - 02 Copyscape
Copyscape suits writers, publishers, and organizations checking online content or monitoring selected pages for copies.
From $4.95/mo Free plan Web · API · Self-hosted9.2 Visit Specs - 03
Noplag The free plan may suit occasional checks of shorter documents, while Pro is positioned for makers and small teams.
From $9.99/mo Free plan Open source Web · Windows · macOS · Linux9.2 Visit Specs - 04 Plagiarisma
It suits students, bloggers and freelance writers who want to check text from a document, URL or pasted passage.
From $8.25/mo Free plan Web · Windows · Android · API9.1 Visit Specs - 05 Dolos
Dolos suits teachers checking programming tests, exams, and exercises where collaboration is permitted within small groups.
Free plan Open source Web · Windows · macOS · Linux9.0 Visit Specs - 06
Originality.ai Originality.ai may suit website owners, content marketers, writers and publishers who need text checks or site scanning.
From $12.95/mo Free plan Web · API · Browser extension9.0 Visit Specs - 07
PlagAware PlagAware suits educational institutions, businesses, and individuals checking or monitoring text for matching content.
From €2.99/mo Free plan Web · API8.8 Visit Specs - 08 Crossref Similarity Check
It suits Crossref members publishing DOI-assigned content who need manuscript similarity reports.
From $3.33/mo Free plan Web · API8.4 Visit Specs - 09
DrillBit Web · iOS · Android · API8.0 Visit Specs - 10 JPlag
JPlag suits educators checking programming exercises and developers looking for duplicated or stolen code parts.
Free plan Linux · API · Self-hosted8.0 Visit Specs - 11
Plagiarism Checker X It suits students, teachers, writers, universities, colleges and SEO agents working on Windows.
Free plan Windows8.0 Visit Specs - 12
PlagiarismSearch It suits students, educators, writers, bloggers, and organizations that need similarity checks or AI-writing indicators.
From $27.95/mo Free trial Web · API · Browser extension7.9 Visit Specs - 13 Plagius
Plagius suits students, researchers, and other document reviewers who need plagiarism checks and AI-writing signals.
From $4.90/mo Free trial Web · Windows · macOS7.9 Visit Specs - 14 SmallSEOTools Plagiarism Checker
The checker may suit students, teachers, writers, bloggers, digital marketers, researchers, and academics who need to review text for matching sources.
From $7.84/mo Free plan Web · API · Browser extension7.9 Visit Specs - 15
Quetext AI Detector It may suit educators, publishers, students, and other reviewers who need AI and plagiarism checks.
From $7.99/mo Free plan Web · API · Browser extension7.8 Visit Specs - 16 DupliChecker From $9.99/mo Web · API7.7 Visit Specs
- 17 iThenticate Web · API7.7 Visit Specs
- 18 MOSS Free plan Web · Linux7.7 Visit Specs
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StrikePlagiarism Free trial Web · API · Self-hosted7.7 Visit Specs - 20
PlagiarismCheck.org It suits students, educators, institutions, researchers, businesses, and developers needing browser, integration, or API-based originality checks.
Web · API · Browser extension7.6 Visit Specs - 21
PrePostSEO Plagiarism Checker The checker suits students, teachers, researchers, content writers, and bloggers who want source matches and downloadable reports.
From $0.63/mo Web · Windows · macOS · iOS7.6 Visit Specs - 22
Plag From €14.95/mo Web7.5 Visit Specs - 23
Plagiarism Detector It is aimed at professionals, students, and teachers who need plagiarism or AI-content checks and originality reports.
Free plan Web · Windows7.5 Visit Specs - 24
Smodin Plagiarism Checker From $10/mo Web · iOS · Android · API7.4 Visit Specs - 25 Plagiat.pl Web7.3 Visit Specs
Report export formats, LMS integration, and API access can help you assess how results may fit into your review process. Noplag, PlagAware, and PrePostSEO Plagiarism Checker are among the options named here. Also consider free-plan availability and paid-from pricing, then weigh those details against the kind of writing you need to review and how you want to work with the results.
Compare Copyleaks AI Detector and Copyscape Get a place on this list